Hi everyone! This is my latest design, a high precision direct extruder using a planetary gearbox plus the big (12mm diameter) dual drive bondtech style gear-set.
Short spek:
Gear ratio - 7.5 (new option 7.2)
Filament pushing force 120Ncm (theoretical) - 12.4 Kg (Wantai stepper)
Filament pushing force 103Ncm (theoretical) - 10.5 Kg (LDO stepper)
Filament acceleration up to 660mm/s^2
Retraction speed: 60mm/s
Overall weight is about 140g
The extruder is driven by a small round nema 14 stepper (86g, 1.88A 13Ncm, Wantai stepper option).
The orbiter printing @ 200mm/s on my MachCube 2.1:https://youtu.be/aZolOWtBbME
In the last months I have experimented with worm gear based extruders with very good results, however not perfect so I decided to go for a different approach.
What I have learned is that the worm gears are not the best choice for extruders. Although high gear ratio gives a good theoretical filament pushing force in reality this is not always true, mainly because the worm gear efficiency is pretty low.…

Ideal for Galileo and Orbiter extruder, high temperature version, integrated gear.   1.8° Step Angle. 200 Steps Per Revolution. 1A Phase. 100 mNm Holding Torque. 17.5mm Body. 500mm bsre wire lead Full spec sheet and drawing